Reactor physics group works on the issue of innovative reactor development for future nuclear energy and associated nuclear data. In this frame it initiated the creation of the PEREN experimental platform (Plateforme d'Etude et de Recherche sur l'Energie Nucléaire), commissioned in 2004, which has now two aspects : one is dedicated to molten salts studies (for molten salt reactors) and the other one is dedicated to neutronic measurements and propose the access to the neutron source facility GENEPI-2.